The Colts are going from a 3-4 defense to a 4-3. With that being the case, linebacker might be one of the few positions on the roster where they have some sort of depth. But with some of those backers moving to defensive end, they decided to increase the depth further by taking Matthew Adams out of Houston.
Adams had a lot of tackles in his final two years at Houston, tallying 82 and 88 tackles in his junior and senior year. He wasn’t very effective rushing the passer though, only recording 6.5 sacks in his career. But he wasn’t asked to be a primary rusher.